Have you tried asking for the option to wear them ahead of time? People tend to be less allowing and less forgiving when you’re trying to be sneaky.

If you’re autistic (or similar) you may even have the right to headphones and other accessibility tools when it’s not a safety hazard. But that means announcing it to the people in charge and communicating your needs and rights beforehand.

Or you can grow your whole hair out to cover your ears, especially if it’s curly it should provide good cover once it’s long enough.

I’m sure you can find this as a wig:

I saw an israeli woman once with a really stealth bluetooth earpiece. I only mention her context because I’ve searched and searched but never found anything similar. You could barely see it.